Carburetor



Max-eh21, 1933. H. scHNEEBELl CARBURETOR Filed Oct. 29, 1931 3 Sheebs-SheefI 1 March 2.1, 1933. H. scHNEEB'ELl 1,902,378

CARBURETOR Filed Oct. 29, 1951 3 Sheets-Sheet 2 March 21, 1933- H. SCHNEEBELI CARBURETOR Filed Oct. 29, 1931 3 Sheecs-'Shee'rl 6.6. /Nve/vfag Patented Mar. 2li, 1933'A narran HUGO scnnnnnnm, or COURBEVOIE, FRANCE cAnBUnn'roR Application filed ctober 9, 1931,Seria No. 571,900, and in France November A7',A 1930.

This invention has for object a carburetor for internal combustion engines, which is so constructed that it does not comprise a constant level tank and is directly supplied with 5 gasoline by the gasoline tank which is under pressure or under partial vacuum. v

This carburetor is essentially characterized by the combination:

L O an atomizing chamber in constant communication with the atmosphere through a cylinder perforated with orilices and a pri-` mary air inlet tube, this chamber being Vso arranged that it can be put in communication with the gasoline intake through a double obturator constituted by a needle valve controlling the flow of gasoline into the Vsaid chamber and adj ustably mounted in a sheath which, connectedthrough a suitable transmission to a control lever actuated by the driver, is longitudinally movable withfthe control needle valve and is Vadapted to close, when the carburetor is at rest, the admission of gasoline in the atomizing chamber;

2.-Oii a tube connected to the said chamber and so arranged as to transmit in the latter the partial vacuum produced by the engine and to carry, into thesuction connecting branch of the engine, the'rich emulsion formed in the said atomizing chamber, this tube having orices open to the atmosphere and so arranged as to mix fresh quantities of primary air with the emulsion circulating in the said tube; Y

3.-Of aV device inrposed between this tube and the engine for intimately mixing, in adjustable quantities, the emulsion drawn into the said tube vwith secondary air and to thus obtained into the suction connecting branch ot' the engine, this device comprising, within a chamber of thecarburetor body which is directly connected to the suction pipe of the engine pierced with secondary air inlet ports:

(a) A fixed sleeve having two superposed annular grooves putting the interior of the said sleeve in communication with the emulsion supply tube, through suitable orilices;V

() A sheath sliding in the said chamber of the carburetor body and in the above fixed sleeve, and so arranged as to be lowered .by a lspring for partly clcsingthe secondary air Y inlet ports when the engine is at rest, and to4` be lifted upon each suction cycle of the said engine, bythe partial vacuum produced in the suction connecting. branch, for uncovering the secondary air inlet portsiand allowingV the admission of this secondary air in the fixed sleeve and its mixing with theeX- plosive gas delivered into. the said sleeve,-

(c) in obturator movable within this sliding sheath for closing the latter to a greater or less extent and controlling'the admission y of secondary` air, this obturator being `con'--` nected, Y by a suitable transmission, to they sheath controlling the admission of gasoline into the atomizingchamber, so as to ensure the simultaneousness of thejcontrol of the admission of gasoline andprimary air and of the control of the admissionof secondary' air. 70

The invention is moreover characterized by thek following points: l y Y (a) The double obturator controlling the admission of gasolineisfso arranged that it can be controlled independently of vthe obturator controlling the admission of second-l aryair; .i y

(b) Thevobturator controlling the admission oil secondary air is provided with a piston, moving with some play in the primary-' air inlet cylinder, in order to balance the efl Vfeet exerted, on the said obturator, by the partial vacuum of the engine and to renderithe control smoother; 1

(c) The sprayer is constituted by a tube which, having` an inner partition perforated,

for the passage of the gasoline, with a central deliver the homogeneous explosive mixture hole, of `adjustable section, for the needle valve, is so shaped, at lthe'endopening in the vaporizing chamber, as to, constitute a seat against which the sheath is pressed vunder the action of a spring for closing the` spraying nozzle; f n 1 (d) The tube constituting the spraying nozzle is provided, on its outer face, with longitudinal grooves'and fits in a circularbore of the sleeve, secured in the carburetor body and in which the double .obturator ,is

lmounted; thissprayingV nozzle is removably secured in its housing by means of a nut 100 Cil' which ensures, at the same time, the locking of the union connecting the spraying nozzle to the gasoline tank, and is perforated with orifices so arranged as to put the atomizing chamber in communication with the atmosphere through the medium of the grooves of the spraying nozzle and to allow, during the suction periods, the admission of primary air in the said chamber, simultaneously with the admission of gasoline supplied by the central orice of the spraying nozzle;

(e) The sheath controlling the opening and closing of the spraying nozzle is so mounted as to longitudinally slide in the sleeve carrying this spraying nozzle and is provided, for that purpose, with an outer flange held in contact with a nut which, journalled on Vthe said sleeve and controlled Yby the driver by means offa suitable transmission, drives the obturating sheath through the medium of its flangel and moves it towards or from the seat of the spraying nozzle;

( f) The .needlevalve controllingthe section of the orifice ofthe spraying nozzle is frictionallymounted within the obturating sheath, and projects outside the latter in the form of a screw-threaded rod provided with a nut and a lock-nut, resiliently held in contact with the flange of the obturating sheath and soarranged as to constitute abutments ensuring the actuation of the need-le valve by the said sheath when the latter is moved to opening position,'and allowing, by a rotation .impartedin'a suitable direction to the said needle valve, to modify its position within the obturating Asheath and to control the initial cross section of the orifice of-the'spraying nozzle aswell as the outflow of the'latter;

(d) The connection ofthe needle valve and of the lobturating sheath is ensured by a spring so arranged as to act on the end of a lever, and interposed between thenut andthe lock-nut of the needle valve, and to hold` the flange of the obturating sheath clamped between the nut of the need-le valve and the nut controlling the simultaneous displacements of the said 4sheath and of the said needle valve, whilsty allowing to adjust the position of the l latter.

A form of construction forming the subject-matter of the invention will be described hereinafter with reference to the accompanying drawings in which ',Fig. 1l is an elevation;

Fig. 2 is a partial vertical longitudinal section made according to line A-A of Fig. 3;

c Fig. 3 is a horizontal section made according to line B-B of Fig. 2.

` Fig. 4 is a vertical cross section made according to line C-,C of Fig. 2.

Fig. 5 is a partial vertical section of another form of construction of the spraying nozzle and of the double O bturatOr.

`As illustrated in the accompanying drawings, the improved carburetor comprises a tubular body 1, Fig. 3, which is connected to the gasoline tank or to the exhauster, by means of a union 2 screwed on one of its ends, and of a suitable connection.

This body l contains a nozzle 3 perforated with a gasoline inlet channel 4, the cross section of which, for controlling the outflow, can be regulated at will by means of a needle valve 5 which, screwing in a sheath 6 sliding inthe body 1, can be rotated by hand in the said sheath through an operating knob 7 and held stationary in any adjusted position by means of a locking member 8 entering one of the notches 9 formed in the head of a nut 10 which is screwed on a screw-threaded part 11 of the tubular body 1 and is connected, by a key 12, to the sliding sheath or tube 6.

This sheath 6 terminates, on the side of the gasoline inlet nozzle 3, in a conical part 13 lever 17 terminating in a fork 18 pivoted at v 19 and between thev branches o-f which the needle valve v5 is retained by its knob '.Y.

By means of this arrangement, it is pos-` sible, when the .valve 13 is pressed upon its seat 14, upon stoppage of the engine, to start the latter by a sudden unseating of the valve 13 by pushing back the lever 17 in opposition to the action of its spring 16.'

During working, the degree of opening of the valve 13` is adjusted as explained hereinafter, by angularly moving the nut 10 which through thev key 11, actuates the unit constituted by the sheath 6 and the needle valve 5. p In fact, this needle valve 5 follows the movementsA imparted to the sheath 6,'the valve 13 of which controls the admission of gasoline or stops the supply of gasoline, but it is to be noted that the position of the said needle valve in this sheath 6, for an outflow adjusted by the latter, is not modified by the displacements imparted to the said sheath 6 and that, when the latter closes, by its valve 13, the gasoline inlet, the needle valve 5 never comes in Contact with the orifice of the channel 4, so that there is no risk of this orifice being damaged and that the control of the` through a series of channels 21,'with 4an annular chamber 22 bounded by a circular bore 23 formed in the outer face ofthe tubular body and by the inner wall and in which is rigidly secured the tubular body l enclosing the double obturator 5-6.

At two diametrally opposite points of the chamber 22 open two channels 26 and 27 communicating together through a circular groove 28 provided in the sheath 6 and put- 33, to the suction connecting branch of the engine, puts moreover the chamber 22 in communication with the said suction connecting branch,so that the partialvacuum produced by the engine is transmitted to thesaid chamber 22, and through the rchannels 26 and 27 and the tube 29, tothe cylinder 30and that the gasoline delivered in the groove 2O is carried in a divided condition, through the channel 2l, into thchamber 22, at the same time as the primary air, admitted through the orifices 3l under the action Vof this partial vacuum, enters the said chamber and intimately mines with the gasoline by pulverizing the latter and forminor a very rich emulsion.

Referring to Fig. 4, it will be seen that the body7 25 is provided, at the place where it is Vconnected to the'suction connecting branch of the engine, with a chamber 33, of circular cross section, communicating, at its lower part, with the atmosphere through ports 34 and having, at its upper part, two orifices l35 and 36 opening-at the top of the tube 32 opposite two conical channels 37 and 38 perforated in plugs 39 and 40 open to the atmosphere through a flared plug 4l, secured in the body 25 and perforated with a flared channel 42, putsthe lower part of the tubef32 in communicationwith the atmosphere.

In the chamberl 33 is rigidly secured a. sleeve 43 Vso shaped as to open in the suction connecting branch of the engine through the opening of larger diameter of a conical bore 44, this sleeve 43 having a cylindrical bore 45 onV the remainder of itsl length.

Externally,this sleeve 43 is provided with two circular grooves 46 and 47 forming, with the inner wall of the chamber 33, two superposed annular chambers respectively arranged opposite the orifices 35 and 36 and perforated, opposite the latter, with holes 48 and 49 putting the said chamber in communication with the interior of the sleeve 43. This of a circular boreVV 24 formed in the body 25 of the carburetorV open to the atmosphere andk orifice a third ting these chambers 46 and Y47 in communication with the interior of the sleeve 43.

In the chamber33 is also mounted a sheath 52 having a cylindroconical inner bore terminating, at its lower part, in a flared opening. This sheath'52 is-so arranged that it can move vertically downwards under the action of a spring 53,v and upwards in opposition to the action Vof this spring, underV thel l effect of the partial vacuum produced by the engine.

.sleeve 43 is moreoverv perforated with two i circular rows of orifices 50V and 51 also put- In its lowest position, corresponding to stoppage of the engin-e, thissh'eath 52 rests" groove .of

on a librel washer 54, fitted in a the body 25, and is thus placed-opposite the additional air inlet ports 34. Y

In its uppermost position, this sheath un- Y covers these Y 55, puts the groove 47 of the. fixed sleeve 43 in communication with the suction `connecting branch offthel engine, through the medium of thesaid sheath and of the sleeve 43.

Within the movable sheath 52 is mounted .an obturator 56, which can bek vertically movedin the said sheath and adapted to modify, according to requirements, the in- .ner cross section of this sheath and to thus control the admission in the latter of secondary air drawn in, through'the ports 34, by the partial vacuum produced by the engine.

This obturator 56, which is subjected, on its upper face,'to the vacuum produced by the engine, as will be explained hereinafter, is lsecured to the upper end of a rod 57, suitably guided in the carburetor body and provided, at its lower end, with 'a washerv 53 mounted with some play in `the primary air inlet cylinder 30 ports 34l and, through an orificev action `of the partial and-adapted to counterbalance the action-of partial vacuum on tl e `head-of the obturatork 56 and to facilitate the operation ofthe latter.v

rllhe rod 57 of this obturator carries, moreover, a rack E9-gearing with a toothed segment 60, rigidly secured on a shaft 61 jourynalled in the body 25.

On this shaft'6l is rigidly secured a twoarm lever 62-63, to both arms of which are respectively connected two links (i4-and 65.

The first of these links is connected, on theY pm of a crank 66 onehand, lto the crank rigidly secured on the nut lO, whilst the second .link 65 is connected, um of a second two-arm lever 67 and 68 pivoted at 69 on the carburetor body,`to a control link 70 so arranged as to be actuated by the driver and to allow theV latter, by simultaneous angular movements imparted to the nut l0 and to the toothed segment 60, to obtain the simultaneousness of control of the sheath 6 and of and, consequently, to control the admission 4of gasoline and primary air in the atomizthrough the medithe obturator 56,I

When the engine stops, the valve 13 closes channels 21, is emulsified with primary the gasoline inlet, and the obturator 56 is` lowered and covered by the sliding sheath 52 which bears, under the action of its spring 53, on the fibre washer 54.

' As the valve 13, rigid with the sliding sheath (i, has been opened by a thrust'exerted on the link 70, it will be understood that gasoline enters the groove 20, and that the obturator 56, which is moved simultaneously with the sheath 6, is introduced inthe movable sheath 52 and closes the latter to a greater orv less extent. The vacuum produced by the engine upon starting, is transmitted in the pulverizing chamber 22 through the sleeve 44, sheath 52 and the orifices 48--49 and 35-36. Under these conditions, itis evident, that the vacuum produced by the engine causes the lifting of the movable sheath 52 and the simultaneous suction in the chamber 22 of the gasoline supplied through 4 and of primary air which is drawn into the said chamber' through the tube or conduit 29 and the cylinder 30 in communication with the atmosphere through the orifices 31.

This partial vacuum causes the lifting of the sheath 52 and the suction, in the chamber 22, of the gasoline distributed by the channel 4 and, at the same time, a primary fair draught which enters the cylinder 30,

through the orifices 31, and is admitted in the chamber `22, through the tube 29, channel 27, groove 28 and channel 26.

rhe gasoline, divided by its passage in the air admitted Vinte the chamber 22, as just explained, and the very rich emulsion thus formed is carried out from the said chamber through the conduit 32.

W'hen entering the latter, this emulsion receives a further quantity of primary air which enters the said tube 32, through the nozzle 42, and intimately mixes with the said emulsion during its upward movement in lthis tube 32.

When issuing from this tube, the gaseous mixture thus formed is drawn towards the suction conduit of the engine, and vpasses through the openings 36 and 35, carrying alone with it further uantities of arimar e cl l Y air which is admitted through the channels 38 and 37 of the plugs 40 and 39.

This gaseous mixture, under the action of the partial vacuum of the engine, circulates 'in both chambers 46 and 47, from which it escapes through the series of orifices 49-43 and 50-51 for entering, in a divided condition, the sliding sheath 52 and the fixed sleeve 43. Within this sheath 52 and sleeve 43, the

V'said gaseous mixture is brought iny contact and intimately mixed, before itsv admission in the suction connecting branch of the engine, with secondary air drawn Vinto the said sheath 52. and into the sleeve 43, this secondary air entering these latter through openings 34 and the annular interval comprised between the sheath 52 and the obturator 56, and the adjustable section of which is determined by the position given to this obturator 56 in the sheath 52, which latter is lifted, as above explained, by the partial vacuum produced by the engine and uncovers the secondary air' inlet openings 34, as shown in Fig. 4.

For ensuring the freedom of movement of the sheath 52, the annular chamber, in which is enclosed the spring 53, is in constant communication, through orifices 71, with the interior of the said sheath, `in order to obtain equality of the pressure within this sheath and within the chamber of the spring.

Moreover, an annular channel 72 is pro vided in thebody 25 andadapted to allow the circulation of the exhaust gases about a jacket 73 in which the sheath 52 slides, and to thus avoid, kin cold weather, the. formation of frost about .thev said sheath and the wedging of the latter. y

Referringto the form of construction illustrated in Fig. 5, it will be seen that the spraying nozzle is constituted by a tube 3 provided with an inner partition, at the centre of which is formed the orifice 4 of the spraying nozzle.

This spraying nozzle, which is introduced in a bore of the body 1, is externally fiuted or provided with grooves extending throughout its length and forming, with the inner wall of the housing receiving the spraying nozzle, a series of longitudinal channels 3,

The spraying nozzle vis held in position in its housing by means of a nut 3() which is screwed on the body 1 and locks, at the same time the union 2 putting the spraying nozzle in communication with the gasoline tank through the medium of a suitable pipe line.

This nut is perforated with orifices 81 putting lthe atomizing chamber 22, formed about the body 1, in communication with the atmosphere, through the channels 3a, asy explained with reference to Figs. 1 to 4.

The spraying nozzle 3 opens, at its inner end, in the groove 20 which is formed within the body 1 and is adapted to simultaneously receive the gasoline delivered by the orifice 4 of the spraying nozzle and the primary air drawn in, during the suction periods of the engine, through the orifices 31 of the nut and entering the said groove 20, through the channels 3a.

The rich mixture formed in this groove 20 is drawn into the atomizing chamber 22, through the orifices 21, perforated in the body 1, between the said groove and this chamber 22.

The section of the orifice 4 of the spraying nozzle is controlled, as above indicated with reference to Figs. 1 to 4, by-a needle valve 5- Which is mounted in the sheathterminating, on the side of the spraying nozzle, in a conical part 13 acting as a valve, and adapted upon stoppage, to fit against a seat 14 provided at the inner end of the spraying nozzle, and to close the latter in absolutely iiuidtight manner.

This sheath 6 is mounted in the body 1 so as to be slidable in the latter, and it isprovided, opposite the atomizing chamber 22, VWith a circular groove 28 putting the said` chamber in communication With the groove 20, in which the gasoline, and the primary air, are simultaneously admitted, during the suction periods,respectively through theoriice 4 ofthe spraying nozzle, and through the channels 3*l of this spraying'nozzle.

At its outer end, this sheath 6 is provided with a flange l5 resiliently pressed against a nut 10 which is screwed on a screw-threaded portion of the body 1 and can be angularly moved on the latter through the medium of a crank 66, rigid with the said nut 10, and

of a suitable'transmission, for causing the rectilinear displacement of the sheath 6 and the opening of the spraying nozzle byunseating the valve 13 rigid With the said sheath, as above explained.

In the form of construction illustrated in Fig. 5, the needle valve 5 Vcontrolling the output of the spraying nozzle is so mounted that it can slide in the sheath 6, outside which itv projects in the form of a screw-threaded rod 5a on which a nut 82 anda lock-nut 83 are screwed.

Between the nut 82 and the lock-nut 83 is arranged a lever 84 pivoted at 85 on an arm 86 rigidly secured on the carburetor and about which is Wound a spring87 bearing,

on the one hand, against the carburetor, and,

on the other hand, against a socket 88, provided With a finger 89 engaging with the free end of the lever 84.

By means of this arrangement` the spring 87, through the medium of the lever 84,

VBushes the needle yvalve 5 towards the spraying nozzle, and, consequently, tends to insert the said needle valve in the orifice 4 of the spraying nozzle.

The said spring 86 holds the liange 15 of the sheath 6 between the nut 82 of theneedle valve and the nut 10 controllingthe rectilinear movementsv of the obturator-sheath 6.

In these conditions, the angular movements imparted to the nut 10 have for effect to simultaneously actuate the obturator-sheath 6 and the needle valve 5, and to close or open the spraying nozzle, according to the direction of the movement imparted to the said nut 10. Y

The initial adjustment of the gasoline outflow through the orifice 4' of the spraying nozzle is eiected by displacing vthe needle y threaded rod 5a,

valve 5 Within the sheath 6. This displacement is obtained by causing the screvvrigid with the needle valve 5, to rotate in the nut 82, and( by locking the. l

needle valve 5 in the desired means of the lock-nut 83; for that purpose, the rod 5a is provided, atits end, with a groove adapted to receive a screvv driver. 1 z

position by It Will be understood that this adjustment can be easily and accurately effected during Working or during the trials of the carbure-l,V tor.

i It Will also beseen that the form of eon struction above described is more simple 'than line tank, Without interposition of a constant lever chamber, a nozzle adapted to constitute a sprayer, in said sleeve, and perforated-With a channel for the admission of gasoline, a conical the said channel, means for controlling the closing, opening and output of the spraying nozzle, an annular chamber formed in the tubular sleeve, about the-conical seat of the spraying nozzle, and adapted to receive gasoi line delivered by the spraying nozzle, a circular groove, provided in the outer Wall of the tubular sleeve and adapted to form With the shape of the carburetor'body, a gasoline atomizing chamber, atomizing chamber in communication With said annular chamber, means for putting the atomizing chamber in communication with the atmosphere for the admission of primary air, its mixing with thegasoline admitted in the said chamber, and the atomizatio'n ofthel gasoline in the form of arich emulsion, means for transmitting in this atomizing vchamber the partial vacuum produced by the engine and supplying the emulsion produced in the said chamber to the suction connecting branch of the engine, means for adding to and mixing with this emulsion further quantitiesof primary air during its passage from the atomizseat surrounding the outlet'oriice of Y f channels putting the Y lthat illustrated in'Figs. 1 to 4,` and, more- :0-

sleeve in direct communication With the gaso- '$.99

necting branch ofthe engine, means for ensuring `the introduction inthis mixture of adjustable quantities of secondary air and for delivering this explosive mixture in the suction connectingbranch of the engine, and

means adapted to ensure the simultaneousness ofthe control of the admission of gaso- Aio body,

line and primary air and of the control of the admission of secondary air.

2. A carburetor for internal combustion engines, comprising: a carburetor body, a tubular sleeve secured in a bore of the said a unionvsecured on the-sleeve and putting the latter in direct Communication with the gasolinetank, Without interposition of a constant level chamber, a nozzle adapted to constitute a sprayer, mounted, in the sleeve,

and perforated with a channel for the admissionof gasoline, a conical seat surrounding the outlet orifice ofthe said channel, a sheath sliding in the tubular sleeve and adapted, upon stoppage of thev carburetor, to lit upon the said conical seat for closing the spraying nozzle, a needle valve mountedin this sheath, moving With the same, and adapted to come opposite the outlet orifice of the spraying nozzle and to control the output of the latter, means for adjusting the position of the needle valve in the sheath Which carries it, means for controlling the displacements of the dou- .ble obturator constituted by the said sheath and the needle valve, an `annular chamber y formed in the tubular sleeve, about the conical seat of the spraying nozzle, and adapted to receive gasoline delivered by the spraying nozzle, a circular groove, provided in the outer 4Wall of the tubular sleeve and adapted to form with the shape of the carburetor body, a gasoline atomizing chamber, channels putting the atomizing chamber in communication with said annular chamber, a circular groove provided in the'outer Wall of the sliding sheath, two channels formed in the tubular' sleeve, a tube connected to one of these channels and to a cylinder perforated with orifices adapted to put the atomizing chamber in communication with the atmosphere, for the admission of primary air in this chamber, its mixing with gasoline and the formation of a rich emulsion, means for transmitting in this atomizing chamber the partial vacuum produced-bly the engine and supplying the emulsion produced in the said chamber to the suction connecting branch of the engine, means for adding to and mixing with this emulsion further-quantities of primary air during its passage from the atomizing chamber to the suction connecting branch of the engine, means for controlling the admission of this mixture into the suction connecting branch of the engine, means for ensuring the introduction in this mixture of adjustable quantities of secondary air and for delivering this explosive mixture in the suction connecting branch of the engine, and means adapted to ensure the simultaneousness of the control of the admission of gasohne and primary an' and of the control of the admission of secondary air. s

9A b trf `ntalffb' o. Y car ure o, or niterna om ust-ion nojines, comprising: a carburetor body, a tu- 'ular' sleeve secured in a bore of the said body, a union secured on the sleeve and putting the latter in direct communication With the gasoline tank, Without interposition of' a constant level chamber, a nozzle adapted to` constitute a sprayer, mounted, in the sleeve, and perforated Wit-h a channel for the admission of gasoline, a conical seat surrounding the outlet orifice of the said channel, a sheath sliding in the. tubular sleeve and, Y adapted, upon stoppage of the carburetor, to fit upon the said conical seat for closing the spraying nozzle, a needle valve mounted in this sheath, moving With the same, and adapted to comefopposite the outlet orifice of the, spraying nozzle and to control the output of the latter, means for adjusting the position of the needle valve in the sheath vwhich carries it, means for controlling Vthe displacements of the double obturator constituted by ,c

the said sheath and the needle valve, an annular chamber formed 1n the tubular sleeve,

about the conical seat of the spraying nozzle,

and adapted to receive gasoline delivered by the spraying nozzle, `a circular groove, provided in the outer Wall of the tubular sleeveV and adapted to form With the shape of the carburetor body, a gasoline atomizing chamber, channels putting the atomizing chamber, in communication with said annular cham- ,s ber, a circular groove provided in the outer Wall of the sliding sheath, tvvochannels formed in the tubular sleeve, a tube connected to one of these channelsand to a cylinder perforated With orifices adapted to put Vthe emulsion circulating in the said tube,

from the atomizing chamber to the suction connecting branch of the engine, anotherk chamber formed in the carburetor body and directly connected to this suction connecting branch-additional air inlet apertures formed inthe Wall ofthe last mentioned chamber, another sleeve fixed in the said last mentioned chamber, tvvo annular grooves provided in the fixed sleeve and oriiices adaptedvto put the interior of the said'sleeve in communication With the tube carryingY the emulsion along, another sheath having a cylindre-conical hore and guided in the last mentioned chamber and in the fixed sleeve and secured in the said chamber, and adapted to be lifted, upon each suction period, by the partial vacuum produced by the engine for uncovering the secondary air inlet apertures and allowing the admission of this secondary air in the fixed sleeve and in the explosive mixture deliveredin the said sleeve, a spring interposed between the fixed -sleeve and the last mentioned movable sheath and adapted to lower the said sheath and to partially obtiirate the additional air inlet apertures upon stoppage of the engine, a movable obturator, housed in the last mentioned sliding sheath and adapted to closethe latter to a greater or less extent and to control the admission of secondary air, and means adapted-toensure the simultaneousness of the control of the admission of gasoline and primary air 'and o f the control of the admission of secondary air.

4a A carburetor for internal combustion engines, comprising: a carburetor body,-a tubular sleeve secured in a bore of the said body, a union secured onl the sleeve and putting the latter in direct communication with the gasoline tank, without interposition of a constant level chamber, a nozzle adapted to constitute a sprayer, mounted, in the tubular sleeve, and perforated with a channel for the adinission of gasoline, a conical vseat surrounding` the outlet oriiice of the said channel a sheath adjusted in the tubular sleeve and adapted to fit, upon stoppage of the engine, on the said conical seat for closing the spraying nozzle in a fluid-tight manner, a needle valve having a screwthreaded rod, mounted in this sheath, moving with the latter, and adapted to come opposite the outlet oriiice of the spraying nozzle and to control the output of the latter, an outerv knob secured to the end of the needle valve and adapted to rotate the needle valve in the sheath, to allow oi moving the said needle valve towards or from the orifice of the s 3ra 1in@ nozzle and to var l .e a

the section and output of the latter, a nut in engagement with a screw-threaded portion of the carburetor body, a liey connecting this nut to the sheath, notches in the said iiutand Va locking member connecting the needle valve to the said nut, a lever transmission adapted to be actuated by the driver and controlling` the rotation of the nut, the displacements of the double obturator constituted by the needle valve and the above sheath and, through the said displacements, the closing, opening and output of the spraying nozzle, a lever, a spring pushing back this lever and holding it against the operating lmob of the needlev valve for closing the spraying nozzle, an annular chamber formed in the tubular sleeve, about the conical seat ot the spraying nozzle, and adapted to receive gasoline delivered by the spraying nozzle, a circular groove, provided in the outer wall of the tubular sleeve and adapted to Jform with the shape of the carburetor body, a gasoline atomizing chamber, channels putting the atomizing chamber in communication with the annular chamber, a circular groove provided in the outer wall of the sheath, two channels formed in the tubular sleeve, a tube connected to one of these channels and to a cylinder perforated with orifices adapted to put the atomizing cliainber in communication with the atmosphere; for the admission of primary air in this chamber, its mixing with gasoline and the formation of a rich emulsion, another tube connected to the atomizing chamber, adapted to put the latter in communication with the suction' connecting branch oi' the engine and to carry the emulsion formed in the said chamber, oriiicesV opening in the last mentioned tube and f adapted to allow the admission of further Vquantities of primary air and tok ensurethe mixing of this air which theemulsion'circulating in the said tube, from theatoniizing chamber to the suction connecting);v branch of the engine, another chamber formed in the carburetor body and directly connected n to this suction connecting branch, additional air inlet apertures formed in the wall oi the last i mentioned chamber, another sleevelixed in.

the said chamber, two annular grooves provided in this fixed sleeve and orifices adaptedfv `each V suction period,by the partial vacuum: `produced 'by the engine for uncovering the secondary air inlet apertures and allowing the admission Of this secondary an ai the and? sleeve andin the explosive mixturedelivered in the said sleeve, a spring interposed between the fixed sleeve andthe last mentioned movable sheath' and adapted to lower the said sheath land to partially obturate the ,addi-V tional air inlet Vaperturas upon stoppage of the engine, a movable obturator, housed in the last mentioned movable sheath and adapted to close thelatter toa greater or less extent 1m and to control the admissionof secondary air, and mea-ns adapted to ensure the simul taneousness of the control of the admission oi' gasoline and primary air and of the control Voi the admission of secondary air;

V 5. A carburetor for internal combustion engines, comprising: aV carburetor body, a tubular sleeve secured in a bore ofthe said body, a union secured on the sleeve and putting the latter in direct communication with the gasoline tank, without interpo'sition of a constant Vlevel chamber, a nozzle adapted' to constitute a sprayer, mounted, inthe sleeve,

and perforated with a channel for the admission of gasoline, a conical seat surrounding the outlet orifice of the said channel, a sheath adjusted in the tubular sleeve and adapted to lit, upon stoppage oi the engine,ro`n the said .conical seatforclosing the sprayin'g'nozzle in a fluid-tight manner, a needle valve having a screw-threaded rod, mounted in this sheath,

moving with the latter, and adapted to come opposite the outlet orilice of the spraying nozzle and to control the output of the latter, an outer lrnob secured to the end of the needle valve and adapted to rotate the needle valve in the sheath, to allow of moving the said needle valve towards or from the orifice of the spraying nozzle, and to vary the section and output of the latter, a nut in engagement with a screw-threaded portion of the carburetor body, a key connecting this nut to the sheath, notches in the said nut and a locking member connecting the needle valve to the said nut. a lever transmission adapted to be actuated by the driver and controlling the r0- tation of the nut, the displacements of the double obturator constituted by the needle valve and the above sheath and, through the said displacements, the closing opening and output of the spraying` nozzle, a lever, a

spring pushing back this lever and holding` it against the operating knob of the needle valve for closing the spraying nozzle, an annular chamber formed in the tubularsleeve, about the conical seat of the spraying nozzle, and adapted to receive gasoline delivered by the spraying nozzle, a circular groove provided in the outer wall of the tubular sleeve and adapted to form with the shape of the carburetor body, gasoline atomizing chamber` channels putting the atomizing chamber in communication with the annular chamber, ay circular groove provided in the outer wall of the sheath, two channels formed in the tubular sleeve, atube connected to one of these channels and to a cylinder perforated with orifices adapted to put the atomizing chamber in communication with the atmosphere,

duced by the engine for uncovering the secondary air inlet apertures and allowing the admission of this secondary air in thelixed sleeve and in the explosive mixture delivered in the said sleeve, a spring interposed between the fixed sleeve and the last mentioned movable sheath and adapted to lower the said sheath and to partially obturate the additional air inlet apertures upon stoppage of the engine, a movable obturator, housed ,in the last mentioned movable sheath and adapted to close the latter to a greater or less extent and to control the admission of secondary air, a rod carrying this obturator and sliding in the carburetor body, a washer secured at the end of the said rod mounted with some play in the primary air inlet cylinder, a rack secured on this rod, a toothed segment meshing with this rack and rigidly secured on a shaft which is adapted to be actuated by thev lever transmission actuating the double obturator and thus-allow to obtain the simultaneousness of the control of the admission of gasoline and primary air in the atomizing chamber and of the admission ofl secondary air in the mixture before its introduction in the suction connecting' branch of the engine` The foregoing specilication of my Carburetor signedby me this 16th day of October 1931. Y y

. HUGO SCHNEEBELI.

for the admission of primary air in this Y chamber`v its mixing with gasoline and the formation of a rich emulsion, another tube connected to the atomizing chamber, adapted to put the latter in communication with the suction connecting branch of the engine and to carry along the emulsion fo-rmedin the said chambenoriiices opening in the last mentioned tube and adapted to allow the admission of further quantities of primary air and to ensure the mixing of this air with the emulsion circulating in the said tube, from the atomizing chamber to the suction connecting branch of the engine, another chamvber formed in the carburetor body and directly connected to this suction connecting branch, additional air inlet apertures formed in thc wall of the last mentioned chamber, another sleeve fixed in the said chamber, two annular grooves provided in this fixed sleeve and orifices adapted to put the interior of the Vsaid sleeve in communication with the last mentioned tube, another sheath having a cylindre-conical bore and guided in the last mentioned Vchamber and in the fixed sleeve, and adapted to be lifted, upon each suction period, by the partial vacuum pro- 

